Year	Percent
1999-01-01	65.175
2000-01-01	65.850
2001-01-01	65.425
2002-01-01	66.200
2003-01-01	66.975
2004-01-01	67.325
2005-01-01	68.100
2006-01-01	68.400
2007-01-01	68.525
2008-01-01	68.700
2009-01-01	67.825
2010-01-01	67.325
2011-01-01	66.825
2012-01-01	66.350
2013-01-01	65.625
2014-01-01	65.025
2015-01-01	64.825
2016-01-01	64.300
2017-01-01	63.900